Tub



FIG. 1 is a perspective view of a tub showing the front and right side of my new design;

FIG. 2 is a left side perspective view, the right side being a mirror image thereof;

FIG. 3 is a top perspective view showing the front and left side thereof; and,

FIG. 4 is a perspective showing the design.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tub, as shown and described. 